Ionized outflows in SDSS type 2 quasars at z similar to 0.3-0.6

Abstract:
We have analysed the spatially integrated kinematic properties of the ionized gas within the inner r? few kpc in 13 optically selected SDSS type 2 quasars at z similar to 0.30.6, using the [O III]lambda lambda 4959,5007 lines. The line profiles show a significant asymmetry in 11 objects. There is a clear preference for blue asymmetries, which are found in 9/13 quasars at 10 per cent intensity level. In coherence with studies on other types of active and non active galaxies, we propose that the asymmetries are produced by outflows where differential dust extinction is at work.